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Layered Double Hydroxide–Carbon Dot Composite: High-Performance Adsorbent for Removal of Anionic Organic Dye
Abstract
It would be of significance to design a green composite for efficient removal of contaminants. Herein, we fabricated a facile and environmentally friendly composite via direct assembly of surface passivated carbon dots with abundant oxygen-containing functional groups on the surface of the positively charged layered double hydroxide (LDH). The resulting LDH-carbon dot composites were characterized by X-ray diffraction (XRD), Fourier transformed infrared (FTIR) spectroscopy, high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), and N2 adsorption-desorption technique. The adsorption performances of the resulting LDH-carbon dot composites were evaluated for the removal of anionic methyl blue dye. Taking advantage of the combined benefits of LDH and carbon dots, the as-prepared composites exhibited high uptake capability of methyl blue (185 mg/g). The adsorption behavior of this new adsorbent fitted well with Langmuir isotherm and the pseudo-second-order kinetic model. The reasons for the excellent adsorption capacity of methyl blue on the surface of the LDH-carbon dot hybrid were further discussed. A probable mechanism was speculated to involve the cooperative contributions of hydrogen bonding between methyl blue and carbon dots and electrostatic attraction between methyl blue and LDH, in the adsorption process. This work is anticipated to open up new possibilities in fabricating LDH-carbon dot materials in dealing with anionic dye pollutants.
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Insights into the modeling of adsorption isotherm systems
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Metadata
- Authors
- Zhang, M., Yao, Q., Lu, C., Li, Z., & Wang, W.
- Venue
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-10-23
- Volume
- 6
- Issue
- 22
- Pages
- 20225-20233
- ISSN
- 1944-8244 (ISSN-L)
- 1944-8252
- OpenAlex
- W2333644974
- Cited by
- 234
- References
- 2
- FWCI
- 13.88
- Type
- journal article
- Language
- en
- Open access
- closed
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